Below is a short plot summary of Guy de Maupassant's short story, "The Piece of String" (if I understand your post correctly).

Maitre Hauchecorne is an old Norman peasant who makes a trip to the town market one autumn day. Being a very crafty and frugal man, when he spots a piece of string in the street, he picks it up, hoping it will come in handy some day. As he is doing so, he sees that Mr. Malandin, an enemy of his, is watching him. Ashamed to be seen picking up items in the street, Hauchecorne pretends to be looking for something else. Later, the town crier reveals that a Mr. Houlbreque has lost his pocketbook containing 500 francs. Hauchecorne is summoned to the mayor's office, where he is accused of finding the missing pocketbook by Malandin. Hauchecorne is innocent of the charge, of course, but he spends the rest of the day telling anyone who will listen of his innocence. The next day, the pocketbook is found, and Hauchecorne is vindicated--he assumes. He again retells his story to everyone he encounters, but he realizes that the joking responses indicate that they do not believe him. He finally comes to realize that everyone believes the original charge--that Hauchecorne had found the pocketbook--but that he had discarded it himself or else had an accomplice to aid him.

Hauchecorne knows he cannot prove his innocence and, though he continues to retell his story, sees that no one believes him. He becomes the butt of jokes in the town and finds himself alone with no friends or supporters. He becomes sick in December and dies the next month;

in his deathbed delirium, his denials of wrongdoing are focused in a single phrase uttered repeatedly: “A little bit of string—a little bit of string.”

In "The Piece of String," written by Guy de Maupassant, Maitre Hauchecorne picks up a piece of string that get him into a world of trouble. Maitre Hauchecorne is criticized unrelentingly for having picked up a piece of string. Hauchecorne is blamed for picking up a wallet instead of his small innocent piece of string, which eventually leads to his death. Hauchecorne dies from the injustice pressure of society, and also his enemy. His non-ability to handle not being forgiven, also contributes to his death.